My first attempt at the power sword glow effect, usually done using blue.

Basecoat

1. Paint the sword as normal. I use the usual Leadbelcher , Nuln Oil / Nuln Oil Gloss , Stormhost Silver method, with some Agrax Earthshade in certain spots - this is a 10k year old Chaos "been in the warp" weapon after all!

Layers

1. Get all the paints on the palette if using a wet palette. I used Mephiston Red Evil Sunz Scarlet Troll Slayer Orange Fire Dragon Bright Yriel Yellow Flash Gitz Yellow and White Scar . I also put some Leadbelcher on the palette for covering mistakes!
2. Work through the layers. Use two or three coats of Mephiston Red , working from and over the node outwards. Try to paint thin lines, thinking how lightning migh move. I also glazed this red around the node and down.
3. Follow and paint inside the previous step with Evil Sunz Scarlet
4. Same, now with Troll Slayer Orange . Keep the paint very thin, and stop going quite as far along, running the paint into recesses and building the colour where the lines meet and intersect.
5. Same again with Fire Dragon Bright , but even less so than before.
6. Sparingly, use Yriel Yellow then a tiny amount of Flash Gitz Yellow only on the hottest or most intersected parts such as around the node.
7. Add a couple of spots of White Scar on the edge and tip of the node.

Finishing Touches

1. I went over the whole blade then with a very dilute mix of Flesh Tearers Red into Contrast Medium (about 1:5). This evens the finish of the blade.
2. Add more Flesh Tearers Red to the previous mix, and glaze around the node to intensify the red.
3. Final step, I mixed Ardcoat and Contrast Medium to add a slightly more glossy finish. It's far less stark than gloss, because of the medium, but brightened everything back up.